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Image Quality Leak in Accelerated 1080p Video Playback

I am wondering why one is experiencing this very noticeable breakdown in terms of image quality when using accelerated playback of non-scaled HD 1080p videos in e.g. mplayer. We see pixel macro-blocks as if the video resolution were ~4 times lower. At the same time unaccelerated (-vo x11) playback gives the clear and sharp result we expect from the HD material (while x11 is unfortunately not an option due to the well known tearing artifacts). As input size equals output size no scaling filters are involved, and x264 pre/post-processing is independent from the output graphic driver. The effect is the same on any other software player (vlc, whatsoever), in a non-compiz environment.

I can't see any restriction on textured video size in the manpage, and no other options than EXA for "AccelMethod" are set in xorg.conf, so any comment, workaround, solution is very appreciated.